''Unio'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

of medium-sized

freshwater mussel Freshwater bivalves are one kind of freshwater mollusc, along with freshwater snails. They are bivalves that live in fresh water as opposed to salt water, which is the main habitat type for bivalves. The majority of species of bivalve molluscs ...

s, aquatic

bivalve Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, biv ...

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is es ...

s in the family

Unionidae The Unionidae are a family of freshwater mussels, the largest in the order Unionida, the bivalve molluscs sometimes known as river mussels, or simply as unionids. The range of distribution for this family is world-wide. It is at its most dive ...

, the river mussels. They are found throughout

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a subcontinent of Eurasia and it is located enti ...

Africa Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...

, and the

Middle East The Middle East ( ar, الشرق الأوسط, ISO 233: ) is a geopolitical region commonly encompassing Arabia (including the Arabian Peninsula and Bahrain), Asia Minor (Asian part of Turkey except Hatay Province), East Thrace (Europ ...

, with some species introduced to

East Asia East Asia is the eastern region of Asia, which is defined in both geographical and ethno-cultural terms. The modern states of East Asia include China, Japan, Mongolia, North Korea, South Korea, and Taiwan. China, North Korea, South Korea ...

. Fossil species are also known from the

Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The J ...

of North America. ''Unio'' is the

type Type may refer to: Science and technology Computing * Typing, producing text via a keyboard, typewriter, etc. * Data type, collection of values used for computations. * File type * TYPE (DOS command), a command to display contents of a file. * Ty ...

genus of the

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

Species

Species in the genus ''Unio'' include: *''

Unio abyssinicus Unio may refer to: * ''Unio'' (bivalve), a genus of freshwater mussels * ''Unio'' (sternwheeler), a steamboat that operated in Oregon, United States, in 1861, before being renamed ''Union'' * UNI/O, an asynchronous serial bus * UNIO Satu Mare, ...

'' Martens, 1866 *''

Unio bruguierianus Unio may refer to: * ''Unio'' (bivalve), a genus of freshwater mussels * ''Unio'' (sternwheeler), a steamboat that operated in Oregon, United States, in 1861, before being renamed ''Union'' * UNI/O, an asynchronous serial bus * UNIO Satu Mare, ...

'' Bourguignat, 1853 *'' Unio caffer'' Krauss, 1848 *'' Unio cariei'' - extinctBouchet, P. & von Cosel, R. 1996.
Unio cariei

2006 IUCN Red List of Threatened Species.
Downloaded on 7 August 2007. (no longer recognised) *'' Unio courtillieri'' Hattemann, 1859 *'' Unio crassus'' Philipsson, 1788 (Thick shelled river mussel) - near threatened *'' Unio damascensis'' Lea, 1863 *'' Unio delicatus'' Lea, 1863 *'' Unio delphinus'' Spengler, 1793 *'' Unio dembeae'' Reeve, 1865 *'' Unio durieui'' Deshayes, 1847 *'' Unio elongatulus'' C. Pfeiffer, 1825 *'' Unio eucirrus'' Bourguignat, 1857 *'' Unio foucauldianus'' Pallary, 1936 *'' Unio gibbus'' Spengler, 1793 *'' Unio hueti'' Bourguignat, 1855 *'' Unio ionicus'' Drouët, 1879 *'' Unio mancus''

Lamarck Jean-Baptiste Pierre Antoine de Monet, chevalier de Lamarck (1 August 1744 – 18 December 1829), often known simply as Lamarck (; ), was a French naturalist, biologist, academic, and soldier. He was an early proponent of the idea that biolog ...

, 1819 * ''

Unio meridionalis Unio may refer to: * ''Unio'' (bivalve), a genus of freshwater mussels * ''Unio'' (sternwheeler), a steamboat that operated in Oregon, United States, in 1861, before being renamed ''Union'' * UNI/O, an asynchronous serial bus * UNIO Satu Mare, ...

'' Drouët, 1883 *'' Unio pictorum'' (

Linnaeus Carl Linnaeus (; 23 May 1707 – 10 January 1778), also known after his ennoblement in 1761 as Carl von Linné Blunt (2004), p. 171. (), was a Swedish botanist, zoologist, taxonomist, and physician who formalised binomial nomenclature, t ...

1758 Events January–March * January 1 – Swedish biologist Carl Linnaeus (Carl von Linné) publishes in Stockholm the first volume (''Animalia'') of the 10th edition of ''Systema Naturae'', the starting point of modern zoological ...

) (Painter's mussel) *''

Unio ravoisieri ''Unio ravoisieri'' is a species of bivalve Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell co ...

'' Deshayes, 1848 *''

Unio sesirmensis Unio may refer to: * ''Unio'' (bivalve), a genus of freshwater mussels * ''Unio'' (sternwheeler), a steamboat that operated in Oregon, United States, in 1861, before being renamed ''Union'' * UNI/O, an asynchronous serial bus * UNIO Satu Mare, ...

'' Kobelt, 1913 *'' Unio terminalis'' Bourguignat, 1852 *''

Unio tigridis Unio may refer to: * ''Unio'' (bivalve), a genus of freshwater mussels * ''Unio'' (sternwheeler), a steamboat that operated in Oregon, United States, in 1861, before being renamed ''Union'' * UNI/O, an asynchronous serial bus * UNIO Satu Mare, ...

'' Bourguignat, 1852 *''

Unio tumidiformis ''Unio tumidiformis'' is a species of bivalve belonging to the family Unionidae. It is endemic to the southwestern Iberian Peninsula. Existing populations are known from the Guadiana, Mira River (Portugal), Mira, and Sado Rivers in Portugal and ...

'' Castro, 1885 *'' Unio tumidus'' Philipsson, 1788 (Swollen river mussel) *''

Unio turtoni ''Unio turtoni'' is a species of medium-sized freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. This species is endemic to France and eastern Spain , image_flag = Bandera de España.svg , ...

'' (='' Unio mancus'')

References

External links

* Bivalve genera {{Unionidae-stub